fs/f2fs/debug.c

   1 /*
   2  * f2fs debugging statistics
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  * Copyright (c) 2012 Linux Foundation
   7  * Copyright (c) 2012 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/fs.h>
  15 #include <linux/backing-dev.h>
  16 #include <linux/f2fs_fs.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/seq_file.h>
  20
  21 #include "f2fs.h"
  22 #include "node.h"
  23 #include "segment.h"
  24 #include "gc.h"
  25
  26 static LIST_HEAD(f2fs_stat_list);
  27 static struct dentry *f2fs_debugfs_root;
  28 static DEFINE_MUTEX(f2fs_stat_mutex);
  29
  30 static void update_general_status(struct f2fs_sb_info *sbi)
  31 {
  32         struct f2fs_stat_info *si = F2FS_STAT(sbi);
  33         int i;
  34
  35         /* validation check of the segment numbers */
  36         si->hit_largest = atomic64_read(&sbi->read_hit_largest);
  37         si->hit_cached = atomic64_read(&sbi->read_hit_cached);
  38         si->hit_rbtree = atomic64_read(&sbi->read_hit_rbtree);
  39         si->hit_total = si->hit_largest + si->hit_cached + si->hit_rbtree;
  40         si->total_ext = atomic64_read(&sbi->total_hit_ext);
  41         si->ext_tree = sbi->total_ext_tree;
  42         si->ext_node = atomic_read(&sbi->total_ext_node);
  43         si->ndirty_node = get_pages(sbi, F2FS_DIRTY_NODES);
  44         si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
  45         si->ndirty_dirs = sbi->n_dirty_dirs;
  46         si->ndirty_meta = get_pages(sbi, F2FS_DIRTY_META);
  47         si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
  48         si->wb_pages = get_pages(sbi, F2FS_WRITEBACK);
  49         si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
  50         si->rsvd_segs = reserved_segments(sbi);
  51         si->overp_segs = overprovision_segments(sbi);
  52         si->valid_count = valid_user_blocks(sbi);
  53         si->valid_node_count = valid_node_count(sbi);
  54         si->valid_inode_count = valid_inode_count(sbi);
  55         si->inline_xattr = atomic_read(&sbi->inline_xattr);
  56         si->inline_inode = atomic_read(&sbi->inline_inode);
  57         si->inline_dir = atomic_read(&sbi->inline_dir);
  58         si->utilization = utilization(sbi);
  59
  60         si->free_segs = free_segments(sbi);
  61         si->free_secs = free_sections(sbi);
  62         si->prefree_count = prefree_segments(sbi);
  63         si->dirty_count = dirty_segments(sbi);
  64         si->node_pages = NODE_MAPPING(sbi)->nrpages;
  65         si->meta_pages = META_MAPPING(sbi)->nrpages;
  66         si->nats = NM_I(sbi)->nat_cnt;
  67         si->dirty_nats = NM_I(sbi)->dirty_nat_cnt;
  68         si->sits = MAIN_SEGS(sbi);
  69         si->dirty_sits = SIT_I(sbi)->dirty_sentries;
  70         si->fnids = NM_I(sbi)->fcnt;
  71         si->bg_gc = sbi->bg_gc;
  72         si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
  73                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
  74                 / 2;
  75         si->util_valid = (int)(written_block_count(sbi) >>
  76                                                 sbi->log_blocks_per_seg)
  77                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
  78                 / 2;
  79         si->util_invalid = 50 - si->util_free - si->util_valid;
  80         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
  81                 struct curseg_info *curseg = CURSEG_I(sbi, i);
  82                 si->curseg[i] = curseg->segno;
  83                 si->cursec[i] = curseg->segno / sbi->segs_per_sec;
  84                 si->curzone[i] = si->cursec[i] / sbi->secs_per_zone;
  85         }
  86
  87         for (i = 0; i < 2; i++) {
  88                 si->segment_count[i] = sbi->segment_count[i];
  89                 si->block_count[i] = sbi->block_count[i];
  90         }
  91
  92         si->inplace_count = atomic_read(&sbi->inplace_count);
  93 }
  94
  95 /*
  96  * This function calculates BDF of every segments
  97  */
  98 static void update_sit_info(struct f2fs_sb_info *sbi)
  99 {
 100         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 101         unsigned long long blks_per_sec, hblks_per_sec, total_vblocks;
 102         unsigned long long bimodal, dist;
 103         unsigned int segno, vblocks;
 104         int ndirty = 0;
 105
 106         bimodal = 0;
 107         total_vblocks = 0;
 108         blks_per_sec = sbi->segs_per_sec * (1 << sbi->log_blocks_per_seg);
 109         hblks_per_sec = blks_per_sec / 2;
 110         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
 111                 vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
 112                 dist = abs(vblocks - hblks_per_sec);
 113                 bimodal += dist * dist;
 114
 115                 if (vblocks > 0 && vblocks < blks_per_sec) {
 116                         total_vblocks += vblocks;
 117                         ndirty++;
 118                 }
 119         }
 120         dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100);
 121         si->bimodal = div64_u64(bimodal, dist);
 122         if (si->dirty_count)
 123                 si->avg_vblocks = div_u64(total_vblocks, ndirty);
 124         else
 125                 si->avg_vblocks = 0;
 126 }
 127
 128 /*
 129  * This function calculates memory footprint.
 130  */
 131 static void update_mem_info(struct f2fs_sb_info *sbi)
 132 {
 133         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 134         unsigned npages;
 135         int i;
 136
 137         if (si->base_mem)
 138                 goto get_cache;
 139
 140         si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
 141         si->base_mem += 2 * sizeof(struct f2fs_inode_info);
 142         si->base_mem += sizeof(*sbi->ckpt);
 143
 144         /* build sm */
 145         si->base_mem += sizeof(struct f2fs_sm_info);
 146
 147         /* build sit */
 148         si->base_mem += sizeof(struct sit_info);
 149         si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
 150         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 151         si->base_mem += 3 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 152         si->base_mem += SIT_VBLOCK_MAP_SIZE;
 153         if (sbi->segs_per_sec > 1)
 154                 si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
 155         si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
 156
 157         /* build free segmap */
 158         si->base_mem += sizeof(struct free_segmap_info);
 159         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 160         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 161
 162         /* build curseg */
 163         si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
 164         si->base_mem += PAGE_CACHE_SIZE * NR_CURSEG_TYPE;
 165
 166         /* build dirty segmap */
 167         si->base_mem += sizeof(struct dirty_seglist_info);
 168         si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(MAIN_SEGS(sbi));
 169         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 170
 171         /* build nm */
 172         si->base_mem += sizeof(struct f2fs_nm_info);
 173         si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
 174
 175 get_cache:
 176         si->cache_mem = 0;
 177
 178         /* build gc */
 179         if (sbi->gc_thread)
 180                 si->cache_mem += sizeof(struct f2fs_gc_kthread);
 181
 182         /* build merge flush thread */
 183         if (SM_I(sbi)->cmd_control_info)
 184                 si->cache_mem += sizeof(struct flush_cmd_control);
 185
 186         /* free nids */
 187         si->cache_mem += NM_I(sbi)->fcnt * sizeof(struct free_nid);
 188         si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
 189         si->cache_mem += NM_I(sbi)->dirty_nat_cnt *
 190                                         sizeof(struct nat_entry_set);
 191         si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
 192         si->cache_mem += sbi->n_dirty_dirs * sizeof(struct inode_entry);
 193         for (i = 0; i <= UPDATE_INO; i++)
 194                 si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
 195         si->cache_mem += sbi->total_ext_tree * sizeof(struct extent_tree);
 196         si->cache_mem += atomic_read(&sbi->total_ext_node) *
 197                                                 sizeof(struct extent_node);
 198
 199         si->page_mem = 0;
 200         npages = NODE_MAPPING(sbi)->nrpages;
 201         si->page_mem += (unsigned long long)npages << PAGE_CACHE_SHIFT;
 202         npages = META_MAPPING(sbi)->nrpages;
 203         si->page_mem += (unsigned long long)npages << PAGE_CACHE_SHIFT;
 204 }
 205
 206 static int stat_show(struct seq_file *s, void *v)
 207 {
 208         struct f2fs_stat_info *si;
 209         int i = 0;
 210         int j;
 211
 212         mutex_lock(&f2fs_stat_mutex);
 213         list_for_each_entry(si, &f2fs_stat_list, stat_list) {
 214                 char devname[BDEVNAME_SIZE];
 215
 216                 update_general_status(si->sbi);
 217
 218                 seq_printf(s, "\n=====[ partition info(%s). #%d ]=====\n",
 219                         bdevname(si->sbi->sb->s_bdev, devname), i++);
 220                 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
 221                            si->sit_area_segs, si->nat_area_segs);
 222                 seq_printf(s, "[SSA: %d] [MAIN: %d",
 223                            si->ssa_area_segs, si->main_area_segs);
 224                 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
 225                            si->overp_segs, si->rsvd_segs);
 226                 seq_printf(s, "Utilization: %d%% (%d valid blocks)\n",
 227                            si->utilization, si->valid_count);
 228                 seq_printf(s, "  - Node: %u (Inode: %u, ",
 229                            si->valid_node_count, si->valid_inode_count);
 230                 seq_printf(s, "Other: %u)\n  - Data: %u\n",
 231                            si->valid_node_count - si->valid_inode_count,
 232                            si->valid_count - si->valid_node_count);
 233                 seq_printf(s, "  - Inline_xattr Inode: %u\n",
 234                            si->inline_xattr);
 235                 seq_printf(s, "  - Inline_data Inode: %u\n",
 236                            si->inline_inode);
 237                 seq_printf(s, "  - Inline_dentry Inode: %u\n",
 238                            si->inline_dir);
 239                 seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
 240                            si->main_area_segs, si->main_area_sections,
 241                            si->main_area_zones);
 242                 seq_printf(s, "  - COLD  data: %d, %d, %d\n",
 243                            si->curseg[CURSEG_COLD_DATA],
 244                            si->cursec[CURSEG_COLD_DATA],
 245                            si->curzone[CURSEG_COLD_DATA]);
 246                 seq_printf(s, "  - WARM  data: %d, %d, %d\n",
 247                            si->curseg[CURSEG_WARM_DATA],
 248                            si->cursec[CURSEG_WARM_DATA],
 249                            si->curzone[CURSEG_WARM_DATA]);
 250                 seq_printf(s, "  - HOT   data: %d, %d, %d\n",
 251                            si->curseg[CURSEG_HOT_DATA],
 252                            si->cursec[CURSEG_HOT_DATA],
 253                            si->curzone[CURSEG_HOT_DATA]);
 254                 seq_printf(s, "  - Dir   dnode: %d, %d, %d\n",
 255                            si->curseg[CURSEG_HOT_NODE],
 256                            si->cursec[CURSEG_HOT_NODE],
 257                            si->curzone[CURSEG_HOT_NODE]);
 258                 seq_printf(s, "  - File   dnode: %d, %d, %d\n",
 259                            si->curseg[CURSEG_WARM_NODE],
 260                            si->cursec[CURSEG_WARM_NODE],
 261                            si->curzone[CURSEG_WARM_NODE]);
 262                 seq_printf(s, "  - Indir nodes: %d, %d, %d\n",
 263                            si->curseg[CURSEG_COLD_NODE],
 264                            si->cursec[CURSEG_COLD_NODE],
 265                            si->curzone[CURSEG_COLD_NODE]);
 266                 seq_printf(s, "\n  - Valid: %d\n  - Dirty: %d\n",
 267                            si->main_area_segs - si->dirty_count -
 268                            si->prefree_count - si->free_segs,
 269                            si->dirty_count);
 270                 seq_printf(s, "  - Prefree: %d\n  - Free: %d (%d)\n\n",
 271                            si->prefree_count, si->free_segs, si->free_secs);
 272                 seq_printf(s, "CP calls: %d\n", si->cp_count);
 273                 seq_printf(s, "GC calls: %d (BG: %d)\n",
 274                            si->call_count, si->bg_gc);
 275                 seq_printf(s, "  - data segments : %d (%d)\n",
 276                                 si->data_segs, si->bg_data_segs);
 277                 seq_printf(s, "  - node segments : %d (%d)\n",
 278                                 si->node_segs, si->bg_node_segs);
 279                 seq_printf(s, "Try to move %d blocks (BG: %d)\n", si->tot_blks,
 280                                 si->bg_data_blks + si->bg_node_blks);
 281                 seq_printf(s, "  - data blocks : %d (%d)\n", si->data_blks,
 282                                 si->bg_data_blks);
 283                 seq_printf(s, "  - node blocks : %d (%d)\n", si->node_blks,
 284                                 si->bg_node_blks);
 285                 seq_puts(s, "\nExtent Cache:\n");
 286                 seq_printf(s, "  - Hit Count: L1-1:%llu L1-2:%llu L2:%llu\n",
 287                                 si->hit_largest, si->hit_cached,
 288                                 si->hit_rbtree);
 289                 seq_printf(s, "  - Hit Ratio: %llu%% (%llu / %llu)\n",
 290                                 !si->total_ext ? 0 :
 291                                 div64_u64(si->hit_total * 100, si->total_ext),
 292                                 si->hit_total, si->total_ext);
 293                 seq_printf(s, "  - Inner Struct Count: tree: %d, node: %d\n",
 294                                 si->ext_tree, si->ext_node);
 295                 seq_puts(s, "\nBalancing F2FS Async:\n");
 296                 seq_printf(s, "  - inmem: %4d, wb: %4d\n",
 297                            si->inmem_pages, si->wb_pages);
 298                 seq_printf(s, "  - nodes: %4d in %4d\n",
 299                            si->ndirty_node, si->node_pages);
 300                 seq_printf(s, "  - dents: %4d in dirs:%4d\n",
 301                            si->ndirty_dent, si->ndirty_dirs);
 302                 seq_printf(s, "  - meta: %4d in %4d\n",
 303                            si->ndirty_meta, si->meta_pages);
 304                 seq_printf(s, "  - NATs: %9d/%9d\n  - SITs: %9d/%9d\n",
 305                            si->dirty_nats, si->nats, si->dirty_sits, si->sits);
 306                 seq_printf(s, "  - free_nids: %9d\n",
 307                            si->fnids);
 308                 seq_puts(s, "\nDistribution of User Blocks:");
 309                 seq_puts(s, " [ valid | invalid | free ]\n");
 310                 seq_puts(s, "  [");
 311
 312                 for (j = 0; j < si->util_valid; j++)
 313                         seq_putc(s, '-');
 314                 seq_putc(s, '|');
 315
 316                 for (j = 0; j < si->util_invalid; j++)
 317                         seq_putc(s, '-');
 318                 seq_putc(s, '|');
 319
 320                 for (j = 0; j < si->util_free; j++)
 321                         seq_putc(s, '-');
 322                 seq_puts(s, "]\n\n");
 323                 seq_printf(s, "IPU: %u blocks\n", si->inplace_count);
 324                 seq_printf(s, "SSR: %u blocks in %u segments\n",
 325                            si->block_count[SSR], si->segment_count[SSR]);
 326                 seq_printf(s, "LFS: %u blocks in %u segments\n",
 327                            si->block_count[LFS], si->segment_count[LFS]);
 328
 329                 /* segment usage info */
 330                 update_sit_info(si->sbi);
 331                 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
 332                            si->bimodal, si->avg_vblocks);
 333
 334                 /* memory footprint */
 335                 update_mem_info(si->sbi);
 336                 seq_printf(s, "\nMemory: %llu KB\n",
 337                         (si->base_mem + si->cache_mem + si->page_mem) >> 10);
 338                 seq_printf(s, "  - static: %llu KB\n",
 339                                 si->base_mem >> 10);
 340                 seq_printf(s, "  - cached: %llu KB\n",
 341                                 si->cache_mem >> 10);
 342                 seq_printf(s, "  - paged : %llu KB\n",
 343                                 si->page_mem >> 10);
 344         }
 345         mutex_unlock(&f2fs_stat_mutex);
 346         return 0;
 347 }
 348
 349 static int stat_open(struct inode *inode, struct file *file)
 350 {
 351         return single_open(file, stat_show, inode->i_private);
 352 }
 353
 354 static const struct file_operations stat_fops = {
 355         .open = stat_open,
 356         .read = seq_read,
 357         .llseek = seq_lseek,
 358         .release = single_release,
 359 };
 360
 361 int f2fs_build_stats(struct f2fs_sb_info *sbi)
 362 {
 363         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 364         struct f2fs_stat_info *si;
 365
 366         si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
 367         if (!si)
 368                 return -ENOMEM;
 369
 370         si->all_area_segs = le32_to_cpu(raw_super->segment_count);
 371         si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
 372         si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
 373         si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
 374         si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
 375         si->main_area_sections = le32_to_cpu(raw_super->section_count);
 376         si->main_area_zones = si->main_area_sections /
 377                                 le32_to_cpu(raw_super->secs_per_zone);
 378         si->sbi = sbi;
 379         sbi->stat_info = si;
 380
 381         atomic64_set(&sbi->total_hit_ext, 0);
 382         atomic64_set(&sbi->read_hit_rbtree, 0);
 383         atomic64_set(&sbi->read_hit_largest, 0);
 384         atomic64_set(&sbi->read_hit_cached, 0);
 385
 386         atomic_set(&sbi->inline_xattr, 0);
 387         atomic_set(&sbi->inline_inode, 0);
 388         atomic_set(&sbi->inline_dir, 0);
 389         atomic_set(&sbi->inplace_count, 0);
 390
 391         mutex_lock(&f2fs_stat_mutex);
 392         list_add_tail(&si->stat_list, &f2fs_stat_list);
 393         mutex_unlock(&f2fs_stat_mutex);
 394
 395         return 0;
 396 }
 397
 398 void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
 399 {
 400         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 401
 402         mutex_lock(&f2fs_stat_mutex);
 403         list_del(&si->stat_list);
 404         mutex_unlock(&f2fs_stat_mutex);
 405
 406         kfree(si);
 407 }
 408
 409 void __init f2fs_create_root_stats(void)
 410 {
 411         struct dentry *file;
 412
 413         f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);
 414         if (!f2fs_debugfs_root)
 415                 return;
 416
 417         file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root,
 418                         NULL, &stat_fops);
 419         if (!file) {
 420                 debugfs_remove(f2fs_debugfs_root);
 421                 f2fs_debugfs_root = NULL;
 422         }
 423 }
 424
 425 void f2fs_destroy_root_stats(void)
 426 {
 427         if (!f2fs_debugfs_root)
 428                 return;
 429
 430         debugfs_remove_recursive(f2fs_debugfs_root);
 431         f2fs_debugfs_root = NULL;
 432 }